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JavaScript Callback HTML Demo
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| <html> | |
| <body> | |
| <h1>OUTPUT;</h1> | |
| <p id="demo"></p> | |
| <script> | |
| "use strict"; | |
| var maxTime = 1000; | |
| var outbox = document.getElementById("demo"); | |
| var evenDoubler = function(input, callback) { | |
| var waitTime = Math.floor(Math.random()*(maxTime+1)); | |
| if(input%2) { | |
| setTimeout(function () { | |
| callback(new Error("Odd Input")); | |
| }, waitTime); | |
| } else { | |
| setTimeout(function () { | |
| callback(null, input*2, waitTime); | |
| }, waitTime); | |
| } | |
| }; | |
| var handleResults = function(error, results, time) { | |
| var output; | |
| if(error) { | |
| output = "ERROR: " + error.message; | |
| } else { | |
| output = "The results: " + results + " (" + time + " ms)"; | |
| } | |
| outbox.innerHTML += output + '<br>'; | |
| console.log(output); | |
| }; | |
| var i; | |
| for(i = 1; i <= 20; i++) { | |
| evenDoubler(i, handleResults); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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